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Richmond Lock and Footbridge is a lock and pedestrian bridge, situated on the River Thames in south west London, England. It is the furthest downstream of all the Thames locks and is the only one owned and operated by the Port of London Authority. It was opened in 1894 and is situated close to the centre of Richmond in the south western suburbs of London. It connects Richmond on the east bank with the neighbouring district of St. Margarets on the west bank during the day, but is now closed at night to pedestrians - after 19:30 GMT or after 21:30 when BST is in use.

Description

Technically, Richmond Lock is a half-tide lock and barrage, which also incorporates a public footbrige. The footbridge crosses both the conventional lock and the barrage, which comprises three vertical steel sluice gates suspended from the footbridge structure. These gates weigh 32 tons each and are 66 feet in width and 12 foot in depth. The lock permits passage of vessels up to 250 feet long by 26 feet 8 inches wide.

For about two hours each side of high tide, the sluice gates which make up the barrage are raised into the footbridge structure above, and river traffic can pass through the barrage unimpeded. For the rest of the tidal cycle the sluice gates are closed, and ships and boats must use the lock alongside the barrage. The barrage has the effect of maintaining the water level between Richmond Lock and Teddington Lock (the next lock upstream) at or above half-tide level. The maximum fall of the lock is 10 feet.

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In set theory, the difference hierarchy over a pointclass is a hierarchy of larger pointclasses
generated by taking differences of sets. If Γ is a pointclass, then the set of differences in Γ is <math>\{A:\exists C,D\in\Gamma ( A = C\setminus D)\}</math>. In usual notation, this set is denoted by 2-Γ. The next level of the hierarchy is denoted by 3-Γ and consists of differences of three sets:
<math>\{A : \exists C,D,E\in\Gamma ( A=C\setminus(D\setminus E))\}</math>. This definition can be extended recursively into the transfinite to α-Γ for some ordinal α.

In the Borel and projective hierarchies, Felix Hausdorff proved that the countable levels of the
difference hierarchy over Π⁰_γ and Π¹_γ give
Δ⁰_γ+1 and Δ¹_γ+1, respectively.

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A deadbolt is a special kind of locking mechanism, providing more security than an ordinary key-operated lock because the weight of the locking bar is usually sufficient to increase break-in time to 10 or 15 minutes.

Unlike most spring-bolt locks, in which the bolt is held in place only by the pressure of a spring and can easily be retracted, a deadbolt lock cannot be opened except by rotating the lock cylinder.

A variant of the standard deadbolt is the vertical deadbolt, which generally rests on top of a door. Vertical deadbolts resist jimmying (in which an intruder inserts a pry bar between the door and the frame and tries to pry the bolt out of the jamb).

Security Features

Many designs are available from manufacturers. Various manufacturers have patented designs offering unique solutions to prevent the locks from being defeated by picking, lock bumping prying, and other forceful attacks.

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Bray Lock is a lock and weir situated on the northern bank of the River Thames near Dorney, just above the M4 Motorway crossing of the Thames. It is a manned lock, and the lock keepers cottage is on an island between the lock and the weir. It is owned and managed by the Environment Agency. Bray itself and Maidenhead, Berkshire, England are on the opposite side of the river but can be reached from the lock.

Reach above the lock

Along the reach is Maidenhead, preceded by Brunel’s famous railway bridge. The Maidenhead bank is lined with large Edwardian houses. The Thames Path follows the Bucks (Eastern) bank to Maidenhead Bridge, which it crosses, and then proceeds on the Berkshire side to Boulter’s Lock.

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In computer science, non-strict two-phase locking, also 2PL, is a locking method used in concurrent systems.

The rules for 2PL are similar to those of Strict 2PL:

1. If a transaction T wants to read/write an object, it must request a shared/exclusive lock on the object.
2. A transaction cannot request additional locks on any object once it releases any lock, and it can release locks at any time (not only at commit time, as in Strict 2PL).

So, every transaction has a growing phase (it acquires locks) and a shrinking phase (it releases locks). 2PL allows only conflict serializable schedules, but doesn’t guarantee that deadlocks will be avoided.

2PL is one scheduling algorithm, sometimes used instead of:

• simultaneous locking, simultaneous release (Disadvantage: redundant locking, no interactive transactions)
• incremental locking, simultaneous release (Disadvantage: Deadlock)
• simultaneous locking, incremental release (Disadvantage: rollback, redundant locking)
• incremental locking, incremental release (Disadvantage: deadlock, rollback)

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Carry On may refer to:

An album:

• Carry On (Chris Cornell album), a 2007 album
• Carry On (Crosby, Stills & Nash album), a 1998 compilation album
• Carry On (Kansas album), a 1992 compilation album
• Carry On (Bobby Caldwell album), a 1982 album by Bobby Caldwell
• Carry On (Pat Green album), a 2000 album by Pat Green

A song:

• “Carry On”, by Crosby, Stills, Nash & Young from the 1970 album Déjà Vu
• “Carry On”, by Diana Ross from the 1999 album Every Day Is a New Day
• “Carry On”, by Angra from the 1993 album Angels Cry
• “Carry On”, by Manowar from the 1987 album Fighting the World
• “Carry On”, by Soul Asylum from the 1986 album While You Were Out

Other:

• Carry On films, a series of British comedy films
• Carry On, a book by Coningsby Dawson

Carry on may also be:

• Luggage that is carried into the passenger compartment of various forms of transport

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Social Discount Rate is a measure used to help guide choices about the value of diverting funds to social projects. For example, it may be used in estimating the value of creating a highway system, schools, or forcing environmental protection. Other uses of the funds are typically presumed to take place more immediately and in the private sector. A social Discount Rate is sometimes denoted as SDR.

The SDR is directly analogous to concepts found in Corporate Finance such as the hurdle rate or the project appropriate discount rate; so the mathematics are identical. A higher SDR makes it less likely a social project will be funded. A higher SDR implies greater risk that the benefits of the project will be reaped.

But there are a number of qualitative differences between social and corporate discount rate and evaluation of projects associated with them. Of course, the governance of social project funding is different, because estimating the benefits of social projects requires making ethically subtle choices about the benefits to others.

For example if we presume that a meteor will wipe all life in a few years the SDR is very high, or alternately if we presume that the population will have many new and wonderful choices capturing benefits (i.e. they will be more wealthy) in the future that too raises the SDR of creating any given benefit. For example choices about the SDR of environmental protection projects, such as funding the reduction of global warming, placing a valuation on future generations.

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